[IMP] *: add debug manager in frontend

Now that the debug mode is stored in session, we need a clear indication that
debug mode is activated.
In backend, the 'fa-bug' is doing the trick but in frontend there is no visible
clue that debug mode is enabled.

This commit separate the debug manager code/feature so we can instanciate it in
frontend only with usefull options (such as enable assets, leave debug mode..).

Now, in frontend, people having access to the navbar (o_main_navbar) will see
the same 'fa-bug' icon with minimal options as mentioned above.
Also, in the footer, there will be another 'fa-bug' icon without any options.
It will be usefull when the navbar is not shown, typically the case for
public user, or for portal (without website installed)).
Clicking on it will simply leave debug mode as hinted in tooltip.

task-1934445
Comes with https://github.com/odoo/enterprise/pull/4281
Closes #33213

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